Gas-mask



J. F. LAMB AND F. E. CARLSON.

GAS MASK.

AVFLFCATION FILED AUG 27,1918.

Patented Aug. 30, 1921.

o4 ff@ uNlTEOs'rjATEs PATENT OFFICE.

JQSEPII F.. LAMB AND FREDERICK n CARLSON, or NEW BRITAIN, CONNECTICUT,

ASSIGNOBS T LANDEBS, FRAIRY AND .A CORPORATION or CONNECTICUT.

CLARK, OF NEW BBITAIN, GONNECTIGUT.

GAS-mst.

To alt/whom# may concern.' l

Be 1t known that we, JOSEPH F. LAMB and United States, each residing at New Britain, .County of Hartford, and State of Connecticut, have invented certain new and useful y lImprovements in Gas-Masks, fully described and represented in the following specification andthe accompanying drawings, forming a part of the same. n

This invention relates to improvements in the eye portion of gas masks and the like and lto the method of producing the same.

In the manufacture of gas masks as'heretofore known, there has been considerable breakage of ther lenses due to the pressure brought to bear thereon in securing the fabric to the lens carrying members.

A further objection to gas masks as heretofore known has been the lack of a sulficiently secure connection between' the lens carryingl parts and the fabric. The result has beenthat many gas masks have been rendered useless because the qfabric was pulled away from Jthelens carrymg -memf bers. f

' It is an object Of the present invention to provide a gas mask Land the method ofproducing the same, such that there is little or no danger of lens breakage during manufac-v ture and suchthat the fabric is so firmly secured to the\ lens 'carrying members that it cannot be 'pulled away therefrom under any ordinary usage.

AVith these general objects,y and others whichV will beobvious to those skilled in the art, inview, the invention consists in the methods hereinafter setV forth, ,and the features, details of construction andcombina f lens holder are secured in place.

Fig. 4 is a similar viewA showingthe fabric secured to the eye piece frame.

Fig. 5 isv a slmilar view showing a modi- `fied form 'of construction for securing theV kFREDERICK E. CARLSON, eachv a citizen of the l applies to both.

lens

specification of etters Patent. Patented Aug, 30 1921.r Application mea August 27, 191s.` serial Nt. 251,600. i i

fabric. f

F1 6 is a transverse sectional view of the older removed; and Fig. 7 1s a view similar to Fi 2, with parts broken away, showing the l dition/of af asket. i

ne feature of the invention consists,

broadly speaking, in securing'the fabric to,

an eye piece frame, and thereafter ksecurin to such frame a separatelens holder whic carrles the lens. In carryingout the invention, the fabric is formed wlth'faneyev Openl ing which is preferably' circularinyshape. .It is understood that as the eye portionsare 1n all respects duplications, kthe descriptionk An eyek piece frame. is

formed of a suitable size-to correspond with the eye opening of the fabric. The fabric is secured to the eye piece frame in any suitable manner, as, for example, according to the method hereinafter described. Y A separate lens holder/.is formed and the 'lens is placed therein. The holder is then s'ecured to the eye piece frame in such manner that the force involved is ap lied outside the periphery`of the lens. t is to be understood that. 1n carrying out the @bove described `method, the steps enumerated need not be carried out in the sequence given as long as the fabric is secured to the eye piece frame before the lens is placed in position.

In 'producing the eye portion of gas I masks according to the method described, there is substantially no danger of lens breakage because the operation of securing the fabric to the eye piece is completed before Vthe lens is inserted and the force involved' andi there 1s no direct is exerted outside the 'periphery of the lens pressure on the'- lens itself.

. A further feature ofthe invention is the securing of the fabric to the eyepiece in such manner as to provide an interlocking relation such that the fabric cannot be pulled kloose under any rdinary usage. In produc.-

.opening of the fabric and the edge of the fabric is placed alongside the skirt-after they `manner illustrated in Fig. 3. The edge of the flange is then turned backoutwardly upon itself to grasp the edge of the fabric. And finally the skirt is furher turned outwardly and downwardly to clamp the fabric in an interlocked relation.

This last step may be carried out in various ways. For example, the skirt, grasping the fabric, may be rolled downwardly and outwardly in a substantial spiral, after the manner illustrated in Fig. 4. Or, as another example, it may be turned down fiat against the frame, as illustrated in Fig. 5. The advantage of the first method is, that during the operation the fabric receives no dead blow; the advantage of the second being an exceptionally firm connection.

The eye portion of a gas mask constructed in accordance with the present invention comprises a portion of fabric having an eye opening, an eye piece frame in which the fabric is secured, and a separate lens holder secured to the eye piece frame. In structures embodying the invention to the best advantage, the eye piece frame has a skirt which is turned back upon itself to grasp the fabric and turned outwardly and downwardly to clamp the fabric in an interlockedrelation. In the embodiment here illustrated as an example, the fabric 9 of the mask is provided with an eye openinfr of suitable size and circular in shape. For insertion in this eye opening is an eye piece fram'e 10.

This latter'member comprises an annular` ring 11, and the ring is provided on one side with an internal skirt 12, which, before the parts are assembled, extends outwardly from the frame substantially at right angies` as shown in Fig. 3. In the completed mask, this skirt has a portion 13 of its edge turned back on itself to grasp the edofe of the fabric and the skirt is further turned outwardly and downwardly to clamp the fabric in an interlocked relation. Fig. 4 illustrates a structure in which the skirt is turned down in a spiral manner and Fig. 5 shows a modification in which it is turned down substantially fiatagainst the frame.

Associated with the eye piece frame is a separate lens holder. As illustrated, as an example, a lens holder 14 is provided having a cylindrical wall 15 turned inwardly and upwardly, as at 16, and terminating in an annular shelf 17 for the lens 18 to rest upon. This lens holder is secured to the eye piece. frame and in structures embodying the invention to the best advantage, the lens holder and the eye piece frame yare provided with cooperating securing portions located outside the periphery of the lens. For example, one of these members may be provided with a flange which is turned down against a portion of the other member to clamp the two together. Although capable of various constructions, in the present ex- 'ing a flange on one of emplification, the eye piece frame 10 is provided at its outer edge on the side opposite the skirt 12, with a fiange 19. The lens holder is provided with an outwardly extending flange or; ring 20 and when the lens holder has been inserted in the eye piece frame, the flange 19 is bent down against the fiange or ring 20, thus clamping thevparts together in the manner shown 1n Fig. 2. This construction provides an effective and simple means of securing the lens holder in the eye piece frame. Furthermore it will be seen that the flanges 19 and 20 are outside the periphery of the lens so that there is no direct pressure on the lens in turning down flange 19.

The eye piece frame may be provided with a bead 21 which forms a seat for the lens. It may be vdesirable to interpose a resilient gasket between the lens and the bead 21. Such a gasket is shown at 22, Fig. 7

Referring to Figs. 3-5, the iiange 19 0f the eye piece frame before it is turned 'down to clamp the lens holder, is shown as being turned obliquely inwardly. With such a construction the operation of bending this flange down against the lens holder is rendered more simple, as a square punch may be utilized.

With the construction described,vthe lens is mounted in such manner that there is little danger of lens breakage and there is an extremely firm connection between the fabric and the lens carrying parts, so that the fabric cannot be pulled loose under any ordinary usage. f'

It is to be'understood that changes in de- 2. The herein described method of pro-v ducingth'e eye portions of gas masks and the like 'which consist in forming an e'ye opening 1n the fabric, forming an eye-piece frame, forming a separate lens holder, forming the eye-piece frame in the eye Opening, securing the fabric to the eye-piece frame, and turning down said flange against a portion'of the other of said members tosecure the lens holder to the eye-piece frame.

3. The herein described method of pro-i4 ducing the eye portions of gas masks 'and the like, which consists in forming an eye said members, insertto grasp the edge of the fabric between ,the

edge of the skirt and the main skirt portion, and further turning the skirt outwardly and downwardly to ,clamp the fabric in an interlocked relation.

4s. The herein described method ofpro- V ducing the eye portions of gas masks and the like, which consists in forming an eye opening in the fabric, forming an eye-piece frame, forming on'the eye-piece frame an internal skirt, inserting said skirt in the eye opening, placing a portion of the fabric alongside said skirt, turning back the edge of the skirt outwardly upon itself to grasp a portion of the edge of the fabric between the edge of the skirt and the main skirt portion, and further turning the skirt outwardly and downwardly in a .substantial spiral to clamp the fabric in an interlocked relation.

5. In combination, an eye-piece framegfor gas masks and the like, having provision for attaching the fabric of the mask, a lens holder, a lens carried thereby, and coperating securing portions carried by the eyepiece frame and lens holder respectivelyV and ocated outside the periphery of the lens.

6. In combination, an eye-piece frame for gas masks and the like, having aportion for clamping the fabric of the mask between such portion and the body of the'eye-piece v frame, .a lens holder, one of saidmembers having a flange turned down to engage a portion of the other of said members, thereby to secure said lens holder in said eye# piece frame, and a lens carried by said holder.

7. In combination, an eye-piece frame forl gas masks and the like, having provision for attaching the fabric of the mask, a lens holder having a flange, a lens carried by said holder, anda flange on said eye-piece frame turned down to engage said first named flange, thereby tosecure the lens holder to the eye-pieceframe.

8. In combination, an eye-piece frame for gas masks and the like, having a skirt turned back upon itself for clamping the fabric of the mask in interlocking relation, and a separate lens holder secured to said eye-piece frame.

9. In combination, an eye-piece frame for gas masks and the like, having a skirt turned back upon itself in a substantial spiral to clamp the edge of the fabric of th'e mask in an interlocked relation, and a separateA lens holder secured to said eye-piece frame.

10. -An eye-pieee'frame for gas masks and the like, comprising an annular ring, an internal skirt on one side of the ring for clamping the fabric in place, an external flange on the other side of the ring for clamping a lens holder in place. 11. An eye-piece frame for` gas masks and the like, comprising an annular ri-ng, an internal skirt on one side of the ring for clamping the fabric in place, and an external, inwardly oblique flange on the other side of the ring for clamping a lens holder in place.

12. In an eye piece frame for gas masks and the like, a ring and a skirt integral with the ring and turned downwardly to directly engage the fabric of the mask a-nd clamp the same against said ring.

13. In combination, an eye-piece frame for gas masks and the like having a ring, a lens holder having a lens embracing portio'n and a flange extending outwardly from said portion, and a flange on said eye piece frame turned down to engage said holder flange to secure the holder to the frame.

14. In combination, an eye-piece frame for gas masks and the like having a ring portion, an' internal skirt extending from one side of the ring andturned back upon itself to grasp the fabric of the mask between the turned back portin and the main fabric in interlocked relation, a lens holder,

a lens carried thereby, a fiange Vextending outwardly from the lens holder, a flange'on the ring of the eye-piece frame for engaglng said holder flange to secure the holder to the frame, and a resilient gasket between the lens and the ring of the eye-piece frame."

In testimony whereof,'we have hereunto ,set our hands.

JOSEPH E. LAMB; FREDERICK E. CARLSON. 

